Line protractor



Neg. 6, 1962 B. J. D! STEFANO 3,061,931

LINE PROTRACTOR Fi led oat 27, 1961 19 E. E7 BENNY J.DiSTEFAN TQR US llnited States Patent 3,061,931 LINE PROTRACTQR Benny J. Di Stefano, 12740 Santa Clara, Detroit, Mich. Filed ()et. 27, 1961, Ser. No. 148,072 1 Claim. (Cl. 331) My invention relates to a new and useful improvement in a line protractor and has for its object the provision of a line protractor which will be simple in construction, economical of manufacture, easy and simple in its use, and highly efficient.

Another object of the invention is the provision of a protractor having a movable stop, movable to various angles on the protractor and provided with an arm carrying a flashlight provided with a terminal which will serve as a circuit closer to the flashlight when the desired angle has been reached.

Other objects will appear hereinafter.

The invention consists in a combination of arrangements and parts hereinafter described and claimed. It is recognized that various modifications and changes may be made in the detail of the structure illustrated without departing from the invention and it is intended that the present disclosure shall be considered to be but the preferred embodiment.

Forming a part of this specification are drawings in which,

FIG. 1 is a plan view of the protractor from the front side,

FIG. 2 is a plan view from the back side,

FIG. 3 is a plan view with the parts moved into aligning position,

FIG. 4 is a sectional view taken on line 44 of FIG. 3.

FIG. 5 is a sectional view taken on line 5-5 of FIG. 3.

As shown in the drawings, the invention comprises a pair of arms or bars 7 and 8 pivotally mounted at 10, and the arm 7 is provided with a protractor 9 suitably graduated. The bar 8 is provided at opposite ends with the clips 11 and 12, the clip 11 being open at the sides as shown in FIG. 4, and the clip 12 being channel shaped. The same clips 14 and 15 are provided on the bar 7. These clips serve to retain the cords, or lines, 13 or 16 in position on the bars.

The retaining band 17 is mounted in embracing relation on the flashlight 18 in such a manner that it is connected to one of the terminals of the flashlight. The band 17 is fixedly mounted on the bar 8 so as to electrically connect the same to the flashlight at one end.

Since the bar 8 is of metal and the bar 7 is likewise of metal, the connection of the bar 3 electrically to one end of the flashlight automatically connects the bar 7 t0 the same end of the flashlight. The bar 8 carries a contact 19 which is connected by the wire 1% to the opposite end of the flashlight.

Slidably mounted on the protractor 9 is a metal plate 21 which is provided with a contact 22. On the opposite side of the protractor 9 is a plate 23 which is pivotally mounted at one end of the plate 21 and connected at the other end with the set screw 24. The construction is such that the plate 21 may be moved to any desired position on the protractor and then fastened in such position. In use, the line 16 would be the established line and When it is desired to establish a line at an angle thereto, the line 13 would be used and moved to the desired position. In moving to this position, it will move the arm 8 around until contact 19 engages contact 22 whereupon the flashlight will light thus indicating that the desired angle of the two lines has been made.

The mechanism described has proven quite efiicient in use as it enables the operator to very quickly establish the proper angularity of the lines.

What I claim is:

A line protractor of the class described, comprising: a pair of pivotally mounted metallic bars; a protractor integrally formed on one of said bars; guide clips on each of said bars for retaining a line positioned therein; a flashlight mounted on one of said bars and having one end electrically connected thereto; a contact on the bar on which said flashlight is mounted and insulated from said bar and electrically connected to the opposite end of said flashlight; a slidable plate on the protractor; an electrical contact on said slidable plate electrically connected thereto; means for fastening said plate in adjusted positions on said protractor; and, the contact on said protractor engaging the contact on said one bar upon rotation to a predetermined position.

No references cited, 

